diff --git a/src/index.js b/src/index.js
index 86dde698..89f8646f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -23,7 +23,7 @@ module.exports = (apiKey, secretKey) => {
         'X-ORIONX-TIMESTAMP': timestamp,
         'X-ORIONX-APIKEY': apiKey,
         'X-ORIONX-SIGNATURE': crypto
-          .createHmac('sha256', secretKey)
+          .createHmac('sha512', secretKey)
           .update(`${timestamp}${postData}`)
           .digest('hex')
       }
diff --git a/test/test.js b/test/test.js
index 30500a21..0a587698 100644
--- a/test/test.js
+++ b/test/test.js
@@ -16,7 +16,7 @@ describe('cha', () => {
           'Content-Type': 'application/json',
           'X-ORIONX-TIMESTAMP': timestamp => /^\d{10}\.\d+$/.test(timestamp),
           'X-ORIONX-APIKEY': '5WGDN4rD3Eqpz9tnMQuqyRCfqZUP4ccJsb',
-          'X-ORIONX-SIGNATURE': signature => /^\w{64}$/.test(signature)
+          'X-ORIONX-SIGNATURE': signature => /^\w{128}$/.test(signature)
         }
       })
         .post('/graphql', {
@@ -48,7 +48,7 @@ describe('cha', () => {
           'Content-Type': 'application/json',
           'X-ORIONX-TIMESTAMP': timestamp => /^\d{10}\.\d+$/.test(timestamp),
           'X-ORIONX-APIKEY': '5WGDN4rD3Eqpz9tnMQuqyRCfqZUP4ccJsb',
-          'X-ORIONX-SIGNATURE': signature => /^\w{64}$/.test(signature)
+          'X-ORIONX-SIGNATURE': signature => /^\w{128}$/.test(signature)
         }
       })
         .post('/graphql', {
@@ -72,7 +72,7 @@ describe('cha', () => {
           'Content-Type': 'application/json',
           'X-ORIONX-TIMESTAMP': timestamp => /^\d{10}\.\d+$/.test(timestamp),
           'X-ORIONX-APIKEY': '5WGDN4rD3Eqpz9tnMQuqyRCfqZUP4ccJsb',
-          'X-ORIONX-SIGNATURE': signature => /^\w{64}$/.test(signature)
+          'X-ORIONX-SIGNATURE': signature => /^\w{128}$/.test(signature)
         }
       })
         .post('/graphql', {
@@ -96,7 +96,7 @@ describe('cha', () => {
           'Content-Type': 'application/json',
           'X-ORIONX-TIMESTAMP': timestamp => /^\d{10}\.\d+$/.test(timestamp),
           'X-ORIONX-APIKEY': '5WGDN4rD3Eqpz9tnMQuqyRCfqZUP4ccJsb',
-          'X-ORIONX-SIGNATURE': signature => /^\w{64}$/.test(signature)
+          'X-ORIONX-SIGNATURE': signature => /^\w{128}$/.test(signature)
         }
       })
         .post('/graphql', {
@@ -120,7 +120,7 @@ describe('cha', () => {
           'Content-Type': 'application/json',
           'X-ORIONX-TIMESTAMP': timestamp => /^\d{10}\.\d+$/.test(timestamp),
           'X-ORIONX-APIKEY': '5WGDN4rD3Eqpz9tnMQuqyRCfqZUP4ccJsb',
-          'X-ORIONX-SIGNATURE': signature => /^\w{64}$/.test(signature)
+          'X-ORIONX-SIGNATURE': signature => /^\w{128}$/.test(signature)
         }
       })
         .post('/graphql', {